Single and Double Window Sight Glasses and Sight ... - Spirax Sarco

6.3 SG253 sight glass
Note:
Before actioning any maintenance programme observe the 'Safety information' in
Section 1.
How to renew the windows and gaskets:
- Isolate the sight glass and allow the pressure and temperature to reduce to ambient
conditions.
- After isolation unscrew the cover bolts (5) and remove the old gaskets (4) and windows (3).
- Carefully clean the recess.
- Refit new gaskets and windows, ensuring that a gasket (4) is fitted to either side of
each window (3).
- Replace the covers (2) and cover bolts (5) and tighten to the recommended torque (see
Table 2).
- After maintenance has been completed, isolation valves should opened slowly to allow
pressure and temperature to build up in a controlled manner.
- Check for leaks.
6.4 Spare parts (for the SG253 sight glass)
The spare parts available are shown in solid outline. Parts drawn in broken line are not
supplied as spares.
Available spares
Set of windows and gaskets 3, 4
Please note: For the DN25 and DN32 sizes a set of bolts (16 A/F M10 x 40) is also included
due to the increased thickness of the glass.
Set of gaskets 4
How to order spares
Always order spares by using the description given in the column headed 'Available spares'
and state the size and type of the sight glass.
Example: 1 off Set of windows and gaskets for a Spirax Sarco DN15 SG253 sight glass.
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IM-S32-04 ST Issue 8